Question

why n heptane is zero​

Answer 1

n-Heptane is the straight-chain alkane with the chemical formula H3C(CH2)5CH3 or C7H16. When used as a test fuel component in anti-knock test engines, a 100% heptane fuel is the zero point of the octane rating scale (the 100 point is a 100% iso-octane).

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Answer 2

This a ISO-octane fuel with a straight  chain of C7H16.